Hi Kolja, I've been facing similar problems when working on the Projector framework. The main problem is that you'll not get the full user/password information out of the user credentials that tomcat provides (for security reasons). My choice was to provide a login-box at portal level and not to use the standard http auth schema. The entered data can be used to pass this information to Slide using the standard http authentication on Slide level. If you want to provide a single user base and expose this to the end user with http auth the only way is to implement Kerberos authentication in your portal and Slide as this enables you to pass the user information from the client to the portal and finally to the Slide server.
Another possible approach is (if you're using only HTTP Basic auth - whether over SSL or not) to simply parse the Authentication header yourself, and get the username (well, you already have that from the servlet API) and the password (which is the key bit!) from it.
Then you can use the client lib as normal.
It does limit you to Basic auth, though, which may cause problems elsewhere. Using an HTML form login, as Daniel suggested, is a good alternative - or you could provide both.
Mike
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